*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:#f5f8fc;color:#0b1f3a;font-size:16px;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif;line-height:1.85}a{color:inherit}button,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #0891b2;outline-offset:5px}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.5;letter-spacing:.02em}h1{font-size:clamp(31px,4vw,49px);font-weight:850}h2{font-size:clamp(24px,2.5vw,31px)}.header{max-width:1180px;margin:auto;padding:24px 30px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #dce4ef}.brand{font-size:27px;font-weight:900;letter-spacing:.08em;text-decoration:none}.brand span{font-size:12px;letter-spacing:.04em;margin-left:16px;font-weight:500;color:#536985}.header nav{display:flex;gap:28px;font-size:14px;font-weight:700}.header nav a{text-decoration:none}main{max-width:1180px;margin:auto;padding:0 30px}.intro{padding:43px 0 34px}.eyebrow{color:#2563eb;font-size:12px;letter-spacing:.09em;font-weight:800;margin-bottom:12px}.lead{color:#50617a;margin-top:14px;font-size:17px}.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:21px}.chips span{font-size:12px;border:1px solid #dce4ef;border-radius:5px;padding:4px 10px;background:white}.mobile{display:none}.video-section{background:#0b1f3a;color:white;border-radius:16px;padding:27px 28px}.video-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.video-section .eyebrow{color:#67e8f9;margin-bottom:5px}.duration{color:#c7d9ed;font-size:13px}.video-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:26px}video{display:block;width:100%;aspect-ratio:16/9;background:#061425;border-radius:8px}.caption{font-size:11px;color:#b9cbe2;margin-top:11px}.chapters h3{font-size:13px;color:#c7d9ed;margin-bottom:11px}.chapters button{display:flex;align-items:center;gap:12px;width:100%;text-align:left;border:0;border-top:1px solid #2a3f5a;background:transparent;color:white;padding:12px 0;font-size:12px;line-height:1.5}.chapters button:hover{color:#67e8f9}.chapters button span{font-size:11px;color:#67e8f9;font-variant-numeric:tabular-nums}.guide-section{display:flex;gap:28px;background:#eaf0fb;margin:38px 0 62px;padding:30px;border:1px solid #d8e3f6;border-radius:12px}.section-number{font-size:42px;color:#2563eb;font-weight:850;line-height:1.4}.guide-copy p:not(.eyebrow){color:#50617a;margin-top:10px;max-width:740px}.actions{display:flex;align-items:center;gap:25px;flex-wrap:wrap;margin-top:22px}.primary{display:inline-flex;align-items:center;justify-content:center;gap:20px;background:#2563eb;color:white;border:0;border-radius:7px;padding:13px 23px;font-weight:750;font-size:14px;text-decoration:none}.primary:hover{background:#1d4ed8}.text-link{font-size:13px;text-underline-offset:5px}.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));list-style:none;counter-reset:s;padding:0;margin:27px 0 30px;gap:24px}.steps li{counter-increment:s;border-top:2px solid #2563eb;padding-top:16px}.steps b{display:block;font-size:16px}.steps b:before{content:counter(s) ' ';color:#2563eb;margin-right:6px}.steps span{display:block;font-size:14px;color:#50617a;margin-top:9px}.prompt-box{background:white;border:1px solid #d5e0ef;border-radius:12px;overflow:hidden}.prompt-toolbar{display:flex;justify-content:space-between;align-items:center;padding:23px 25px;gap:20px}.prompt-toolbar p{font-size:12px;color:#65758b}.prompt-toolbar b{font-size:16px}textarea{display:block;resize:vertical;width:calc(100% - 50px);margin:0 25px 20px;min-height:280px;height:310px;border:1px solid #d8e2ef;border-radius:7px;padding:20px;color:#233650;background:#f8fafc;font-size:14px;line-height:1.9}.prompt-bottom{display:flex;justify-content:space-between;gap:18px;background:#f8fafc;padding:16px 25px;font-size:12px;color:#526681;flex-wrap:wrap}.prompt-bottom a{white-space:nowrap}#copy-status{padding:0 25px;color:#166534;font-size:13px}#copy-status:not(:empty){padding-bottom:14px}.check-note{display:flex;gap:17px;margin:23px 0 58px;color:#435770;font-size:14px}.check-note>span{font-size:23px;color:#2563eb}.faq{max-width:850px;margin-bottom:65px}.faq h2{font-size:21px;margin-bottom:18px}.faq details{border-bottom:1px solid #d7e1ed;padding:16px 0;font-size:14px}.faq summary{cursor:pointer;font-weight:700}.faq p{padding-top:12px;color:#50617a}footer{background:#0b1f3a;color:white;padding:30px max(30px,calc((100vw - 1120px)/2));display:flex;justify-content:space-between;align-items:center}footer p{color:#b9cbe2;font-size:12px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:800px){.video-layout{grid-template-columns:1fr}.chapters{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.chapters h3{grid-column:1/-1}.steps{grid-template-columns:1fr;gap:20px}.video-section{padding:22px}.video-heading{align-items:flex-start;gap:10px}.duration{white-space:nowrap;margin-top:24px}.guide-section{padding:24px;margin-bottom:44px;gap:18px}.prompt-toolbar{align-items:flex-start}}@media(max-width:480px){.header{padding:18px 20px}.brand{font-size:23px}.brand span{display:none}.header nav{gap:17px;font-size:12px}main{padding:0 20px}.intro{padding:30px 0}.mobile{display:block}.desktop{display:none}.lead{font-size:15px}.video-section{padding:18px;margin:0 -8px}.video-heading h2{font-size:23px}.duration{display:none}.chapters{grid-template-columns:1fr}.chapters button{font-size:14px;padding:12px 0}.caption{font-size:12px}.guide-section{display:block;padding:22px}.section-number{font-size:30px;margin-bottom:10px}.guide-copy h2{font-size:24px}.guide-copy p:not(.eyebrow){font-size:14px}.actions{gap:18px}.prompt-toolbar{flex-direction:column;gap:16px;padding:20px}.prompt-toolbar .primary{width:100%}textarea{width:calc(100% - 40px);margin:0 20px 20px;padding:14px;font-size:14px}.prompt-bottom{padding:16px 20px}.check-note{font-size:13px}footer{padding:25px 20px;gap:20px;align-items:flex-start}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.seek-label{display:flex;align-items:center;gap:14px;font-size:11px;color:#b9cbe2;margin-top:12px}.seek-label input{min-width:0;flex:1;accent-color:#22d3ee}.video-time{display:block;text-align:right;font-size:11px;color:#b9cbe2;font-variant-numeric:tabular-nums}